Why does my car AC only work on high speed?

Into why your car AC only work on high speed. what is a blower motor resistor? Blower motor resistors are used to control the fan speed of automotive blowers motor. The fan speed can be changed either by switching the blower resistor resistance mechanically, or by using the main AC switch, and also electronically by the air conditioning system.

How does an air conditioner change the fan speed?

Blower motor resistors are used to control the fan speed of automotive blowers motor. The fan speed can be changed either by switching the blower resistor resistance mechanically, or by using the main AC switch, and also electronically by the air conditioning system.

Why is my AC not working at 3000 rpm?

While I cannot promise the values will work for your Lancer due to regional variations, the fact that there is a high-side cutoff can explain the AC not working above 3000 RPM. What’s so special about 3000 RPM?

Why does my car disengage the AC at 70%?

If you press more than 70%, the system will disengage the AC to save power for the engine as it assumes that you are trying to overtake or climp up a hill. If your TPS is not not sensing the position of your throttle properly, it will definately turn off your AC at normal cruising RPM.

Why does my heater not work on high speed?

Heater blower motor will not work on high speed? I have replaced the black bosch relay behind the glovebox, the blower resistor and the blower motor and still cannot get the blower to work on high. I remember in older model years of gmc’s and chevys that their was a high speed blower relay that caused this issue.

Why does my AC blower motor not work?

The blower motor relay supplies power to this motor when you turn the switch to “on” that can sometimes fail. When this happens, you may notice that you will not feel anything blowing out of the vents at all. This may also cause the blower motor to work intermittently.

Why does my rear AC blower keep spinning?

But #36 looks like it would stop it only if the HVAC CM-Aux was the fault. If you pull #36 and it keeps spinning then it is the BMCP-Aux. The blower motor control processor controls the speed of the blower motor by increasing or decreasing the voltage drop on the ground side of the blower motor.

Why is my rear AC not turning off?

Today I disconnected both the front seat (near the shifter) and first rear seat controls for the rear AC. It didn’t change anything. I finally removed the fuse under the first rear seat to get it to stop blowing. Less than a year ago I replaced the front blower motor control module because the front speeds weren’t working right.

Why is my blower motor only working at high speed?

The first thing that needs to be determined is the type of noise that is present and the possible sources. Rattling or knocking noises while… The blower motor only working on high speed is a common symptom of a failing blower motor resistor; but the fact the radio stopped working at the same time is unusual.

Why is my central air conditioner not blowing hard?

Most of the time, a frozen evaporator is caused by 1 of these 2 issues: Low airflow issues (dirty air filter, blocked vents or malfunctioning blower) Low refrigerant levels, usually caused by a refrigerant leak

How does a high speed blower motor work?

In the highest fan speed state, the blower resistor is bypassed completely and the fan is effectively connected directly to the car’s battery, allowing maximum current to be supplied to the blower motor.

What are the symptoms of a bad blower motor resistor?

No air from the vehicle’s vents. Another symptom of a faulty blower motor resistor is no air from the vehicle’s vents at all. Power to the blower motor is fed through the blower motor resistor, so if it fails or has any issues power can be cut off to the motor. A blower motor without power will not be able to produce any air pressure,…